Directed Assembly of Multi-Walled Nanotubes and Nanoribbons of Amino Acid Amphiphiles Using a Layer-by-Layer Approach |
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| Authors: | Kathrin Siegl Dr. Luba Kolik-Shmuel Dr. Mingming Zhang Dr. Sylvain Prévost Dr. Kalanit Vishnia Prof. Amram Mor Dr. Marie-Sousai Appavou Dr. Charl J. Jafta Prof. Dganit Danino Prof. Dr. Michael Gradzielski |
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| Affiliation: | 1. Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany;2. CryoEM Laboratory of Soft Matter, Faculty of Biotechnology and Food Engineering, Technion—Israel Institute of Technology, Haifa, 3200003 Israel;3. Institut Max von Laue-Paul Langevin (ILL), 71 avenue des Martyrs, 38042 Grenoble, France;4. Faculty of Biotechnology and Food Engineering, Technion—Israel Institute of Technology, Haifa, 3200003 Israel;5. Forschungszentrum Jülich GmbH Jülich Centre for Neutron Science (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergerstr. 1, 85747 Garching, Germany;6. Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), 14109 Berlin, Germany |
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| Abstract: | Monodisperse unilamellar nanotubes (NTs) and nanoribbons (NRs) were transformed to multilamellar NRs and NTs in a well-defined fashion. This was done by using a step-wise approach in which self-assembled cationic amino acid amphiphile (AAA) formed the initial NTs or NRs, and added polyanion produced an intermediate coating. Successive addition of cationic AAA formed a covering AAA layer, and by repeating this layer-by-layer (LBL) procedure, multi-walled nanotubes (mwNTs) and nanoribbons were formed. This process was structurally investigated by combining small-angle neutron scattering (SANS) and cryogenic-transmission electron microscopy (cryo-TEM), confirming the multilamellar structure and the precise layer spacing. In this way the controlled formation of multi-walled suprastructures was demonstrated in a simple and reproducible fashion, which allowed to control the charge on the surface of these 1D aggregates. This pathway to 1D colloidal materials is interesting for applications in life science and creating well-defined building blocks in nanotechnology. |
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| Keywords: | amino acid amphiphiles cryogenic transmission electron microscopy layer-by-layer assembly multilayer nanotubes small-angle neutron scattering |
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